coward vs actor

coward and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
coward	Yes	No	No	No
actor	Yes	No	No	No

As nouns, actor is a hypernym of coward; that is, actor is a word with a broader meaning than coward:

Other hypernyms of coward include doer, worker.

coward (noun)	actor (noun)
a person who shows fear or timidity	a theatrical performer
	a person who acts and gets things done